为什么会报错 怎么修改？

Question

public class Person {
    private String name;
    private int  age;
    private String gender;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }
    public String toString(){
        return name+","+age+","+gender;

    }
}



public class OosDemo {


    public static void main(String[] args) {
        Person p=new Person();
        p.setName("suffer");
        p.setAge(20);
        p.setGender("nan");

        System.out.println(P);
    }
}

最后一行代码 在输出P报错

Answer 1

 主要把最后一行的 System.out.println(P);  改为 System.out.println(p); 试下看看：

public class Person {
    private String name;
    private int  age;
    private String gender;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public String toString(){
        return name+","+age+","+gender;
    }
}

public class OosDemo {

    public static void main(String[] args) {
        Person p=new Person();
        p.setName("suffer");
        p.setAge(20);
        p.setGender("nan");
        System.out.println(p);
    }
}